Metal halide perovskite photodetectors: Material features and device engineering
Wang Ye1, 2, Gao Meng-Lei1, 2, Wu Jin-Liang1, 2, Zhang Xing-Wang1, 2, †
       

(a) The structure of perovskites with formula ABX3, in which A represents cations (MA, FA, and Cs+), B represents metal cations (Pb2+ and Sn2+), and X represents halogen anions (Cl−, Br−, and I−).[75] (b) Schematic structures of 2D (RNH3)2[ABX3]nBX4 perovskites (n = 0, 1, and 2) and 3D ABX3 perovskite ( n = ∞ ), in which A ′ denotes the R NH 3 + cations.[71]